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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: Continuous seismic monitoring of Nishinoshima volcano, Izu-Ogasawara, by using long-term ocean bottom seismometers

Fig. 3

Comparison of LT-OBS and infrasonic records with the plume flow from the crater (upper) and photographs of the plume emission from Nishinoshima volcano (lower). Upper: detection of a plume above Nishinoshima using video recorded on the R/V Kairei. Images just above the crater were retrieved, and brightness was averaged on the images. The ascending plume corresponds to a trajectory of black images toward the upper right. Pink and black curves indicate infrasonic data with a filter of 1–7 Hz and vertical component of seismic records in the NI11 with a bandpass of 4–8 Hz. Considering travels times, infrasonic records and LT-OBS records have delays of 17.7 and 7 s, respectively. A packet of seismic events is related to a series of plume emissions. Lower: pictures at an interval of 5 s retrieved from the video are shown with infrasonic and LT-OBS records

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